BMR Calculator
Your weight is less than it ideally should be. See your doctor or health professional and discuss whether you may need to aim at gaining weight. They can help you think of small, practical changes you feel comfortable with to achieve a healthy weight.
You may weigh less than you ideally should. Unless you’re naturally very slim, you may need to consider ways of gaining weight to bring your BMI to between 20 and 25. If you do feel you need to put on some weight, it is still important to eat a healthy diet. Exercise can help too.
Your BMI is currently within what is considered a healthy weight range. Being a healthy weight has important benefits as it can help reduce your risk of heart disease, diabetes and a range of other conditions.
Your weight appears to be a bit above the ideal range. You might like to talk to your doctor about whether you need to set yourself a new target for a healthy weight. If you are at all concerned or have any health problems, check with your doctor before you start any new exercise programs or eating plans.
You currently weigh more than is ideal. This puts your health at risk and is of increasing concern, particularly as you get older. Talk to your doctor about your BMI and discuss an appropriate and healthy weight for you.
*According to the National Health and Medical Research Council, a healthy BMI is between 20-25 for most adults.
Weight: You have entered a number outside the available range 30kg - 250kg / 66.15lb - 551.25lb.
Height: You have entered a number outside the available range 91cm - 250cm / 3ft 0in- 8ft 2in.
Instructions
BMI is calculated by dividing your weight in kilograms by your height in metres squared.
Enter your measurements and click ‘calculate’ for your body mass index.
If your BMI is above or below the normal range but you consider yourself to be of normal and healthy weight for your height, chat with your doctor about any potential health concerns.
BMI introduction
BMI is a measurement of a person's leanness or corpulence based on their height and weight, and is intended to quantify tissue mass.
It is widely used as a general indicator of whether a person has a healthy body weight for their height. Specifically, the value obtained from the calculation of BMI is used to categorize whether a person is underweight, normal weight, overweight, or obese depending on what range the value falls between.
These ranges of BMI vary based on factors such as region and age, and are sometimes further divided into subcategories such as severely underweight or very severely obese.
Being overweight or underweight can have significant health effects, so while BMI is an imperfect measure of healthy body weight, it is a useful indicator of whether any additional testing or action is required.
Refer to the table below to see the different categories based on BMI that is used by the calculator.
BMI table for adults
This is the World Health Organization's (WHO) recommended body weight based on BMI values for adults. It is used for both men and women, age 18 or older.
| Category | BMI range - kg/m2 |
| Underweight | < 18.5 |
| Normal | 18.5 - 24.9 |
| Overweight | 25 - 29.9 |
| Obese Class I | 30 - 34.9 |
| Obese Class II | 35 - 39.9 |
| Obese Class III | > 40 |
BMI chart
Risks associated with being overweight
Being overweight increases the risk of a number of serious diseases and health conditions. Below is a list of said risks, according to the Centers for Disease Control and Prevention (CDC):
- High blood pressure
- Higher levels of LDL cholesterol, which is widely considered "bad cholesterol," lower levels of HDL cholesterol, considered to be good cholesterol in moderation, and high levels of triglycerides
- Type II diabetes
- Coronary heart disease
- Stroke
- Gallbladder disease
- Osteoarthritis, a type of joint disease caused by breakdown of joint cartilage
- Sleeping and breathing problems
- Certain cancers (endometrial, breast, colon, kidney, gallbladder, liver)
- Low quality of life
- Mental illnesses such as clinical depression, anxiety, and others
- Body pains and difficulty with certain physical functions
- Generally, an increased risk of mortality compared to those with a healthy BMI
As can be seen from the list above, there are numerous negative, in some cases fatal, outcomes that may result from being overweight.
Generally, a person should try to maintain a BMI below 25 kg/m2, but ideally should consult their doctor to determine whether or not they need to make any changes to their lifestyle in order to be healthier.
Risks associated with being underweight
Being underweight has its own associated risks, listed below:
- Malnutrition, vitamin deficiencies, anemia (lowered ability to carry blood vessels)
- Osteoporosis, a disease that causes bone weakness, increasing the risk of breaking a bone
- A decrease in immune function
- Growth and development issues, particularly in children and teenagers
- Possible reproductive issues for women due to hormonal imbalances that can disrupt the menstrual cycle. Underweight women also have a higher chance of miscarriage in the first trimester
- Potential complications as a result of surgery
- Generally, an increased risk of mortality compared to those with a healthy BMI
In some cases, being underweight can be a sign of some underlying condition or disease such as anorexia nervous, which has its own risks.
Consult your doctor if you think you or someone you know is underweight, particularly if the reason for being underweight does not seem obvious.
BMI formula
BMI= weight (kg) / [height (m)]2
BMI= weight (lb) / [height (in)]2 x 703
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